RFR: 8338417: Explicitly pin a virtual thread before acquiring the JFR string pool monitor [v2]

[Markus Grönlund]

On Thu, 15 Aug 2024 09:46:04 GMT, Alan Bateman <alanb at openjdk.org> wrote:

>> Good point, thanks.
>
> Yes, it should only unpin if pin completed successfully.

Please see updated changeset.

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PR Review Comment: https://git.openjdk.org/jdk/pull/20588#discussion_r1718203932